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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac5ab7ec74ce8233b264727a7cab98853969ac7bc2976052178c39c8c4d6460' 
  AND token = 'Zupiy1wo5J4ZvkoiSjktRPtlzwsjMhm3W394KRz8qzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}